@Per utramque cavernam: Sure, I can make Module:alternative forms recognize a Wiktionary link field. Technically it's possible by putting wikt:Appendix:French spelling reforms of 1990 (so that the link is w:wikt:Appendix:French spelling reforms of 1990, which means the link goes to Wikipedia and then back to Wiktionary), but that would be a silly solution. — Eru·tuon 03:11, 14 March 2018 (UTC)